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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Vliv různých teplot na konkurenceschopnost raka mramorovaného v agresivních interakcích
 KREJČÍ, Miloslav
Crayfish are an important aquatic ecosystems engeneers. Non-indigenous crayfish often decrease the abundance of native species and they affect ecosystem balance. Changes in freshwater ecosystems are usually caused by invasive species of crayfish, especially North American species. These species transmit crayfish plague (Aphanomyces astaci) too. One of these species is marbled crayfish (Procambarus virginalis).Aim of the thesis was an experimental comparison of the competitiveness of marbled crayfish in interspecies interactions with red swamp crayfish (Procambarus clarkii), signal crayfish (Pacifastacus leniusculus) and spiny-cheek crayfish (Faxonius limosus) depending on water temperature. The experiment included 20 runs of interspecific interactions at 16 °C, 18 runs of interspecific interactions at 20 °C and 19 runs of interspecific interactions at 24 °C. Interactions occurred in individual plastic tanks with tempered water. Interactions in tanks were recorded by camera. Subsequently, the agonistic interactions of crayfish were evaluated from 30 minutes of recordings. In conclusion, marbled crayfish is competitive opponent for psychrophilic and thermophilic crayfish species, especially at higher temperatures. The global warming could increase the success of spreading to new areas for marbled crayfish, as well as the survival of winter. In new areas, marbled crayfish could cause negative impacts for native organisms, especially native crayfish species.
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Kompetice o úkryt mezi hlavačkou mramorovanou a hlaváčem černoústým
 KREJČÍ, Miloslav
Non-native species very often causes reduction of quantity or they completely replace the native species. One of reasons of this phenomenon is competition for habitat and shelter. Shelter is essential for bentic and primarily for speleophilous fish species to keep stable populations. Non-native species compete for shelter not only with native fauna, but also with other non-natives species too. The aim of the B. Sc. thesis was experimental evaluation of shelter competition between western tubenose goby (Proterorhinus semilunaris) and round goby (Neogobius melanostomus) in dependence upon shelter type, time of the day, sex and species. The experiment was conducted in eleven trials with 16 repetitions (tanks) in each trial. Western tubenose goby was always the resident fish in each trial. Invader was either conspecific (intraspecific competition) or round roby (interspecific competition). Two types of shelter were used ("plant imitation" and "rocky substratum imitation"). Shelter occupancy was evaluated in four 1-hour intervals (two intervals during the day and two during the night). The course of experiment was recorded by cameras with infrared ilumination. Solitary fish (without intruder) spent significantly longer time in shelter during the day regardless of sex and shelter type. In the intraspecific competition (western tubenose goby vs. western tubenose goby), the resident fish spent more time in the shelter than the intruder. In the interspecific competition (western tubenose goby vs. round goby), the intruder spent more time in the shelter compared to situations when western tubenose goby was intruder. In conclusion, round goby could be considered more aggressive species than western tubenose goby. It could explain successful spread of round goby in the natural conditions.
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